RUNRACE : Service & Maintenance Manual - rev. 2.0
Page 6.24
Follow the procedure step by step to correctly diagnose the problem. Take particular care with the
checks highlighted by circled numbers, which are described in detail below:
(1) Place the tester probes between terminals AL0 and AL1 of the inverter. Under an alarm
condition the measured voltage should be 0 Vdc, under normal conditions it should be +10
Vdc.
(2) As for point (1) but between pins 3 (signal) and 4 (ground) of connector CN1 on the inverter
interface board.
(3) Place the tester probes between pins 9 (signal) and 3 (ground) of connector CN2 on the
inverter interface board. Under an alarm condition the measured voltage should be 0 Vdc,
under normal conditions it should be +5 Vdc.
(4) As for point (3) but between pins 9 (signal) and 1 (ground) of free connector CN1.
(5) As for point (4) but between pins 9 (signal) and 3 (ground) of connector CN1 on the CPU
board.
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